△ABC中,AB=4,BC=3,∠ABC=90°,
∴AC=5.
△ABC~△ADB,
∴AB/AD=AC/AB,
∴AD=AB^2/AC=16/5.
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△ABC中,AB=4,BC=3,∠ABC=90°,
∴AC=5.
△ABC~△ADB,
∴AB/AD=AC/AB,
∴AD=AB^2/AC=16/5.